[daip] A question about ICHANSEL within AVSPEC

[Eric Greisen]

Rick Perley wrote:
>    Eric:
> 
>    I'm trying to select 'chunks' of my  Herc A spectral data for 
> testing.  For my current test, I'm selecting a single IF (#4), and I 
> want a central 'chunk' 34 MHz wide.  The channel width is 2 MHz, so I 
> want 17 channels.    So, I put BIF = 4, EIF = 4, and ICHANSEL = 
> 24,41,1,4.  This got me a 96 MHz-wide chunk!!!
>    So, I then put BIF=4, EIF=4, and ICHANSEL = 24,40,0,0.  This got me 
> what I wanted.
>    So, why did my first attempt get me a 96 MHz-wide chunk of data?

The header was constructed from the first IF not BIF and the output FQ 
table was "corrected" without understanding that the IFs and things had 
already been altered.  Should be okay tomorrow.

ERic